https://community.nxp.com/t5/NFC/PN7160B-refuses-to-accept-write-command/m-p/1498873#M9574 <P>What could be the reason if PN7160B takes MISO down immidiately after CS is set low?</P><P>I have custom board with the chip and it worked and read cards.&nbsp; Yesterday it started to behave like this.</P><P>I think it fails some internal checks, but how to debug it? Voltages on supply pins are correct and external crystal is oscillating at 27.12 MHz</P><P>&nbsp;<span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Clipboard03.jpg" style="width: 999px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/188672iDFA147A428DCA242/image-size/large?v=v2&amp;px=999" role="button" title="Clipboard03.jpg" alt="Clipboard03.jpg" /></span></P><P>&nbsp;</P><P>&nbsp;</P> Mon, 01 Aug 2022 14:09:39 GMT Erklei 2022-08-01T14:09:39Z https://community.nxp.com/t5/NFC/PN7160B-refuses-to-accept-write-command/m-p/1498873#M9574 <P>What could be the reason if PN7160B takes MISO down immidiately after CS is set low?</P><P>I have custom board with the chip and it worked and read cards.&nbsp; Yesterday it started to behave like this.</P><P>I think it fails some internal checks, but how to debug it? Voltages on supply pins are correct and external crystal is oscillating at 27.12 MHz</P><P>&nbsp;<span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Clipboard03.jpg" style="width: 999px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/188672iDFA147A428DCA242/image-size/large?v=v2&amp;px=999" role="button" title="Clipboard03.jpg" alt="Clipboard03.jpg" /></span></P><P>&nbsp;</P><P>&nbsp;</P> Mon, 01 Aug 2022 14:09:39 GMT https://community.nxp.com/t5/NFC/PN7160B-refuses-to-accept-write-command/m-p/1498873#M9574 Erklei 2022-08-01T14:09:39Z